Evaluation of mechanical properties of a dense SiC/SiCN composite produced via PIP process
Date Issued
2022-03-01
Abstract
The material behavior of Polymer Infiltration and Pyrolysis based SiC/SiCN composites is studied and the characteristic thermal and mechanical properties in on- (0/90 °) and off-axis (±45 °) direction are summarized. The tensile properties are determined at room temperature and 1300 °C. Based on the ratio of Young’s modulus and strength between on- and off-axis loading, a new approach for the classification of Weak Matrix Composites (WMC) and Weak Interface Composites (WIC) is proposed, which seems to be reasonable for various CMCs. Even without fibre coating mechanical behavior of SiC/SiCN is similar to that of WIC. In order to explain this, a microstructure model is developed and confirmed by analysis of fracture surface. The effect of temperature on the tensile properties is investigated through analysis of residual thermal stresses. Even though at 1300 °C the strength is slightly lower, the fracture strain increased significantly from RT to 1300 °C.
Subjects
Ceramic-matrix composites (CMCs)
;
SiC/SiCNMechanical behavior
;
Weak Matrix Composites (WMC) and Weak Interface Composites (WIC)
;
High-temperature properties
Type
journal article
Journal/Edited collection
Start page
775
End page
785
Secondary publication
Yes
Document version
Postprint
Language
English
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